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London is on a mission to transform itself into a transit-efficient and pedestrian-friendly megacity. Is this the shape of the future?

Paris' ambitious Velo Liberte bike initiative encourages residents to forgo cars for bikes and public transportation. In the process, the programme has fostered a unique popular culture, complete with its own language, jokes and pick-up lines.

Most foods now travel an average of 2,400km from farm to plate. As renowned author Michael Pollan elaborates, the impacts of this fossil fuel-driven system are detrimental to the environment, but also to our health and social wellbeing.

In 2003, the city of Seoul took a rare step back in time, demolishing a major downtown freeway to uncover and restore the ancient Cheonggyecheon stream. Now, it's a vital part of the city's commercial and tourism sectors.

Thanks to a progressive public transportation portfolio that includes train, streetcar, bus and aerial tram, the American city of Portland has become a global model of transit-oriented development.

Even if regional transportation becomes more efficient, people and goods will still need to travel the world. This episode looks at new technologies and policies that could offset the aviation industry's substantial greenhouse gas emissions.